u-n ambassador susan rice confronts some of her top critics on capitol hill. and leaves >>> if you don't know what happened just say you don't know. >> u.n. ambassador susan rice confronts critics on clip and leaves them more agitated than ever. rice upset lawmakers with her initial take on the deadly attack on the u.s. consulate in benghazi. today she tried to clear things up. cbs reporter danielle nottingham shows us didn't seem to work. >> reporter: some gop lawmakers are still not satisfied with u.n. ambassador susan rice's explanation of what happened at the u.s. consulate in benghazi, libya. >> we are significantly troubled by many of the answers that we got and some that we didn't get. >> reporter: senators john mccain, lindsey graham and kelly ayotte have been vocal critics of rice, accusing the ambassador of misleading the public when she said five days after the deadly benghazi attack there was no evidence it was preplanned. >> we are going to get to the bottom of this. we have to have a system we can trust. and if you don't know what happened, just